Rotary dies



Jan. 18, 1949. L. e. ROBINSON ROTARY DIES Filed Feb. 7, 1945 INVENTOR. L6. KoE/NsoN Patented Jan. 18, 1949 UNITED STATESQVPATENT OFFICE ROTARY DIES Liddell G. Robinson, Corcoran, Calif. Application February '7, 1945, Serial No. 576,593

2 Claims. 1

This invention relates together.

A further object of this invention is to provide to pipe joining dies and has for an object to provide an improved pair of dies for joining sheet metal elbow or pipe sections a pair of rotary dies for crimping the flanges on 1 sheet metal pipe or elbow sections together into a tight joint, and is useable for .both heavy and light gauge work.

A still further object of this invention is to provide a pair of rotary die members wherein both members are female members, and wherein one female die member acts as an anvil for the other female die member.

Yet a further object of this invention is to provide a pair of female die members wherein the members are substantially identical except for a difference in the width of the dieing grooved recesses, and wherein the wider recessed die is first used for heavy gauge work, and wherein the narrower recessed die is for the finishing operation on the heavy gauge work, and for the complete operation on the lighter gauge work, with the other die serving as an anvil.

A still further object of this invention is to provide a pair of rotary female dies which are beveled towards their ends and away from their dieing grooved recesses to permit elbow sections to be operated thereon.

Other features and advantages of the invention will appear in the following description and accompanying drawing.

In the drawing- Fig. 1 is side elevation of shaft end of an elbow and angle crimping machine showing the dies of this invention in operative position;

Fig. 2 is an end view on line 2-2 of Fig. 1;

Fig. 3 shows the first stage in the operation of joining two sheet metal pipes, and

Fig. 4 shows the second stage in the operation.

There is shown at H) the arm of a rotary machine, either power or manually operated, having a pair of cooperatively geared shafts H with reduced necks l2 for receiving the dies [3 and [4 of this invention thereon, the necks 12 being threaded to receive the die securing washers l5 and nuts I6 thereon for removably holding the dies l3 and I4 thereon.

Each of the dies 1 3 and I 4 is suitably bored to cooperate with the shaft necks l2. Each of the dies l3 and I4 is shaped substantially as shown, each being provided with two beveled sides leading to a cylindrical surface divided by a peripheral groove. While the sizes and dimensions of the parts of the dies depend on the particular machine on which they are to be attached, in an average size, the dies are about one and one-half inches thick and two inches in diameter.

The two dies I3 and i4 differ from each other only by the width of the groove. The groove H in die !3 is one-eighth inch wide by one--quarter inch deep, While the groove la in die [4 is threesixteenths inchwide by one-quarter inch deep. The cylindrical surfaces 20 left on each side of the grooves I7 and iii are one-eighth inch wide. The angle of the bevel is preferably as steep as possible according to the strength of the material in the die, for the steeper the bevel, the better the dies operate.

In operation, assuming that the pipes 2| and 22 to be joined are ZG-gauge or lighter, pipe 2| being already provided with the usual male flange 23 and pipe 22 with the female flange 24. The male flange 23 is inserted in the female flange 24 in the first stage as shown in Fig. 3 and seated therein in one or two spots with a hammer; in the second stage as in Fig. 4. The work is then placed about the die [4 so that the flange joint enters into the groove ll of die l3, the shafts H being so mounted to allow a sufficient temporary separation to permit this to be done. Then, with the joint in the groove ll, the shafts are rotated, causing the dies to rotate and rotate the work, thus forming a complete tight joint between the two pipes 2| and 22 as at 26.

If the work is of heavier gauge, as 18 or 20- gauge, for instance, the pipes are first placed about the die [3 with the joined flanges inserted into the groove l8 of die 14, and the dies rotated, thus forming the heavy joint as at 21. After the heavy joint 2'! i completed, the work is removed from about die l3 and placed about die [4, and the heavy joint 21 is inserted into the groove ll of die I3 and the dies rotated, thus forming the heavy joint 21 into the tight joint 26.

Thus, with heavy gauge work, first the wider groove is used, and then the narrower groove, and with light gauge work, only the narrower groove is used. In either case, however, the die about which the work is placed serves as an anvil for the other die, and eliminates the need for male and female dies, and permits the same pair or dies to serve for both light and heavy gauge work.

The operation is the same when working on elbow sections to make an elbow, but in elbow operations, the presence of the beveled ends is important in enabling sections to be joined together at angles to each other.

From the above description of my invention .it will be evident to one skilled in the art that still other variations in details of construction may be incorporated within the spirit of the invention and appended claims.

What I claim is:

1. In a die device for crimping an outwardly angulated flange on one pipe section into gripping engagement with an outwardly extending flange of less diameter on a second pipe section, a pair of rotary female dies beveled toward both their axial ends, cylindrical peripheral portions located between the beveled portions, and grooved rectangular recesses extending into said cylindrical portions at approximately the mid-line of said cylindrical portions, the cylindrical portions on one die providing an anvil for work extending into the grooved recess of the other die, the grooved recess of one die being wider than that of the other die, means for rotatably supporting said dies in cooperative positions opposite each other with the anvil surfaces of one die overlapping the anvil surfaces of the other die, whereby the wider grooved recess die may be used with the other die as an anvil for making a preliminary heavy joint in heavy gauge work and the narrower grooved recess die is then used with the first die as an anvil for making the final tight joint, and in light gauge work-only the narrower grooved recess die is used with the first die as an anvil for making the complete tight joint.

2. In a die device for crimping an outwardly angulated flange on one pipe section into gripping engagement with an outwardly extending flange of less diameter on a second pipe section, a pair of rotary dies, each having a rectangular groove in its outer periphery and having two cylindrical an- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 200,689 Brombacher Feb. 26, 1878 1,487,899 Sturges et a1 Mar. 25, 1924 1,564,894 Purnell Dec. 8, 1925 FOREIGN PATENTS Number Country Date Great Britain 1851 

